Joint Power Headroom Report for LTE-NR Coexistence
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently allocating resources for radio access technologies (RATs) that operate using different transmission time interval (TTI) durations, leading to suboptimal power headroom reporting and resource management.
Innovation Solution
A user equipment (UE) is configured to generate and transmit multiple power headroom reports (PHRs) or a joint PHR based on different TTI durations, allowing for improved resource allocation by the base station, with the UE semi-statically splitting transmission power and dynamically managing power between multiple RATs, and reporting power headroom information more frequently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE reports separate PHRs for each RAT based on their respective TTI durations, then the base station obtains accurate power headroom information for each RAT, but the reporting complexity and signaling overhead increase
Solution Approach 1:
The patent combines power headroom information from multiple RATs with different TTI durations into a single joint PHR report. The UE calculates power headroom for each RAT separately based on their respective TTIs, then merges these values into one comprehensive report transmitted to the base station, reducing signaling overhead while maintaining accuracy
Solution Approach 2:
The joint PHR report serves multiple functions simultaneously: it provides power headroom information for LTE, NR, and potentially other RATs in a single message structure. This universal reporting mechanism eliminates the need for separate PHR procedures for each RAT, simplifying the overall reporting process
2Productivity
If the UE transmits multiple separate PHRs for different RATs, then the base station can allocate resources more accurately for each RAT, but the signaling overhead and network traffic increase
Solution Approach 1:
The patent merges multiple PHR transmissions into a single joint PHR report that contains power headroom values for all configured RATs. This consolidation reduces the number of separate signaling messages transmitted over the air interface, directly reducing signaling overhead and network traffic while preserving all necessary information for resource allocation
3Reliability
If the UE uses different PHR reporting schedules for different RATs, then each RAT's specific TTI requirements are met, but the scheduling complexity and time management overhead increase
Solution Approach 1:
The patent establishes a unified PHR reporting timeline in advance that is synchronized with the shortest TTI duration among all configured RATs. This preliminary scheduling arrangement allows the UE to prepare and transmit joint PHR reports at predetermined intervals, ensuring that power headroom information is available for all RATs without complex real-time scheduling decisions
Solution Approach 2:
The patent adjusts the PHR reporting periodicity parameter to match the shortest TTI duration (e.g., NR slot duration), which automatically ensures that reporting intervals are appropriate for all longer TTI durations as well. This parameter adjustment simplifies the scheduling mechanism while maintaining TTI synchronization across different RATs
Data Source
AI summary
Methods, systems, and devices for wireless communication are described. Generally, the described techniques provide for a power headroom report for multiple radio access technologies (RATs). A user equipment (UE) may support multiple RATs that correspond to different transmission time intervals (TTIs). A UE may determine a reporting schedule for power headroom reports (PHRs) for a first RAT and a second schedule for PHRs for a second RAT. The UE may generate a PHR for the first RAT and a companion PHR for the second RAT, and may transmit the PHR and companion PHR based at least in part on the first PHR schedule. In some examples, the UE may receive a PHR type from the base station, and may determine a joint PHR based on the type. The UE may determine a joint PHR schedule based on a granularity of supported RATs.